[time-nuts] What's the time Mr Wolf...

[Steve Rooke]

Hi,

This may have already been covered in this group so please excuse me
for not combing the archives. I could Google for this but I'll get a
quicker answer here and I know it will be the correct one.

!) Who decides on what is the correct time?
2) Is the time standard stored on one master grandfather clock?
3) As (2) is unlikely, if a number of clocks are involved, are they in
different countries?
4) As (3) is likely, how are they synchronised?
5) If this involves communicating with each other, what medium is used
and how are delays handled (a la NTP pings)?
6) If all the clocks are synchronised in one place and then
transported all over the World, how is the Einstein affect of time
dilation handled due to the clocks changing in flight?

Now the interesting ones (for me anyway).

7) Where are the clock(s) located which provide the time for the GPS satellites?
8) If they are actually in the satellites, how are they all kept
synchronised with each other and the "master grandfather clock" on the
ground?
9) Are the satellites in geostationary orbit?
10) If they are geostationary, or move in relation to the ground, how
are the affects of the Einstein time dilation handled as they may be
travelling at a different speed than a point on the surface of the
Earth?
11) Extrapolating this, a point on the Equator would be moving faster
that a point at the poles or even Greenwich, for that matter. So would
a clock at each location move out of synchronisation with each other?

Aren't you glad I'm back :) BTW, where is /tvb these days, I haven't
seen any postings by him while I have catching up?

73
Steve - ZL3TUV
-- 
Steve Rooke - ZL3TUV & G8KVD
Omnium finis imminet